{"refrec":{"BRefID":365619,"RR":"<b>van Haren, H.</b> (2023). Unusual mooring oscillations: apparent Foucault–Wheatstone device in the deep ocean? <i>J. Mar. Sci. Eng. 11(5)</i>: 1087. <a href=\"https://dx.doi.org/10.3390/jmse11051087\" target=\"_blank\">https://dx.doi.org/10.3390/jmse11051087</a>","BEntID":363341,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":" <i>J. Mar. Sci. Eng. 11(5)</i>: 1087. <a href=\"https://dx.doi.org/10.3390/jmse11051087\" target=\"_blank\">https://dx.doi.org/10.3390/jmse11051087</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"van Haren, H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"van Haren, H.","Englishabstract":"A pressure sensor, located for four months in the middle of  a 1275 m-long    taut deep-ocean mooring in 2380 m water depth above a seamount  with    sub-surface top-buoys and seafloor anchor-weight, demonstrates narrow-band    spectral peaks of deterministic well-predictable signals with equivalent 0.5    m  amplitudes at uncommon sub-harmonic frequencies f*/4, f*/2, 3f*/4 of the    local  near-inertial frequency f* = 1.085<i>f</i>, where <i>f</i> denotes    the Coriolis parameter. None of these sub-harmonics can be associated with    oceanographic motions, which are dominated by super-inertial internal waves    that are more broadband and less predictable. No corresponding peaks are    found  in spectra of other observables like current velocity (differences),    temperature, and pressure in the top buoy of the mooring. The mid-cable    pressure sensor was mounted on a nearly 1 kN weighing non-swiveled frame.    Its  data are hypothesized to reflect a resonant mechanical oscillation of    the  high-tensioned elastic steel mooring cable under repeated short-scale    Strouhal  cable vibrations induced by vortex-shedding due to water-flow drag    and/or  possibly by tidal baroclinic motions that are about 50% larger near    the sloping  seafloor of the seamount than mid-depth thereby modifying the    mooring-cable in  a helical shape. Cable dynamics and mooring-motion    considerations yield  inconclusive results to explain the observations.    Hypothesizing, the  observations suggest, cable dynamically, sub-harmonic    drainage of helix-shape  source at non-tidal semidiurnal center-frequency (M    <sub>2</sub> + S<sub>2</sub>)/2 = 3f*/2, physically, the measurement of    Earth rotation thereby mimicking a  Foucault–Wheatstone device, and,    oceanographically, the relative  vortex-rotation <i>ζ</i>/2 = 0.085 <i>f</i>    being possibly induced by  water-flow interacting quasi-permanently with the    nearby seamount by a  topographic obstruction, so that total local    near-inertial frequency f* = <i>f</i> + <i>ζ</i>/2.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Unusual mooring oscillations: apparent Foucault–Wheatstone device in the deep ocean?","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:32:50.698602","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"1 km-long taut-wire deep-ocean mooring; non-swiveled mid-cable pressure sensor; deterministic signals at near-inertial sub-harmonics; sharp spectral peaks; mooring vibrations due to deep-ocean currents; seamount-related relative vorticity","OtherDescriptors":null,"Notes":null,"AnaPub":2023,"MonPub":null,"DateUpdate":"2023-07-10","DateCreate":"2023-07-10","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000998065300001","VABBcode":null,"OpenAcc":1,"DOI":"10.3390/jmse11051087"},"refs":null,"anarec":{"AnaID":365619,"PubliDate":2023,"Pagination":"1087","XtraPublOfAnaID":null,"ISBN":null,"Volume":"11","Issue":"5","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":251606,"SerRR":"Journal of Marine Science and Engineering. 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